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Current-induced noise and damping in nonuniform ferromagnets

Jørn Foros, Arne Brataas, Yaroslav Tserkovnyak, and Gerrit E. W. Bauer
Phys. Rev. B 78, 140402(R) – Published 10 October 2008

Abstract

In the presence of spatial variation in the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuation-dissipation theorem, the fluctuations at thermal equilibrium are related to the viscous magnetization damping, which in nonuniform ferromagnets acquires a nonlocal tensor structure. At the hand of spin spirals, we demonstrate that the current-induced noise and damping increase with the gradient of the magnetization texture and becomes significant for narrow domain walls.

  • Figure
  • Received 14 March 2008

DOI:https://doi.org/10.1103/PhysRevB.78.140402

©2008 American Physical Society

Authors & Affiliations

Jørn Foros1, Arne Brataas1, Yaroslav Tserkovnyak2, and Gerrit E. W. Bauer3

  • 1Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
  • 2Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
  • 3Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands

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Issue

Vol. 78, Iss. 14 — 1 October 2008

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